Illuminated dial.



PATENTED APR. 24, 1906 C. P. FERNALD.

ILLUMINATED DIAL. APPLICATION FILED AUG. 2,

UNITED STATES "PATENT OFFICE.

CHARLES F. FERNALD, OF ROXBURY, MASSACHUSETTS, ASSIGNOR TO STAR BRASS MANUFACTURING CO., OF BOSTON, MASSACHUSETTS,- A CORPORATION OF MASSACHUSETTS.

ILLUMINATED DIAL.

Specification of Letters Patent.

Patented April 24, 1906.

Application filed'AuguBt 2, 1905. Serial No- 272,4 19- T all whom it may concern.-

Be it known that I, CHARLES F. FERNALD, a citizen of the United States, residing at Roxbury, in the county of Suffolk and State of Massachusetts, have invented new and useful Im rovements in Dial-Illuminating Devices, 0 which the following is a specification.

This invention relates to a device for illuminating the dials of steam-gages, clocks, and the like, the object of the invention being to provide a device in which a' lamp, preferably an electric lamp, can be readily attached to the casing of a steam-gage or clock and the rays of light from said lamp be directed across the face of the dial between the dial and the glass which covers it.

The object of the invention is, further, to provide a device of the character set forth which can be readily attached to or detached from steam-gages or clocks and which shall be neat and ornamental in its appearance and which shall also thoroughly protect and cover said lamp to guard against accidental breakage thereof.

The invention consists in the combination and arrangement of parts set forth in the following specification and particularly pointed out in the claims thereof.

Referring to the drawings, Figure 1 is a front view of a steam-gage with a lam attached thereto and in a manner embo yin my invention, the left-hand portion of sai figure being in elevation. and the ri ht-hand portion partly in elevation and part y in section on line 1 1 of Fig. 2. Fig. 2 is a side elevation viewed from the right of Fig. 1, broken away and shown partly in section on line 2 2 of Fig. 1. Fig. 3 is a perspective view of an insulating-block. Fig. 4 is a side elevation of the portion of the 1am socket into which the lamp is screwed, toget er with one of the terminal plates attached thereto. Figs. 5 and 6 are side elevations of two portions of the lamp-socket. Fig. 7 is an underneath plan view of the cover for the lamp with a reflector therein.

Like numerals refer to like parts throughout the several views of the drawings.

In the drawings, 10 is the casing of a steam-gageof any suitable construction; 11, the ring thereof, and 12 the glass on said ring, said ring and glass forming together a cover. A bracket or car 13, integral with the ring 11, rojects outwardly therefrom and is provide with a downwardly-depending annular rim 14, which is interiorly screwthreaded at its lower end to receive a screwthreaded lamp-holder 15.

The lamp-socket 16 consists of a receptacle formed of insulating material in two parts 17 and 18, and these two parts are clamped together and against the under side of the bracket 13 by the holder 15.

The electric lamp 19 is screwed into 8. cylindrical shell 20, located inside another shell 21, said shell 21 projecting into a cylindrical core in the insulated portion 17 of the socket 16. One of the terminal plates 22 is fastened to the shell 21, and to this terminal plate is fastened the electric wire 23 by a screw 24, the other electric wire 25 of the lampcircuit being fastened by a screw 26 to the terminal plate 27, said terminal plate 27 being fastened by a contact-screw 28t'o'the shell 21, said contact-screw 28' clamping the terminal plate 27 to the shell 21, it bein understood that the terminal plate 27 an the contact-screw 28 are insulated from said shell and from the terminal late 22 by the insulating-block 29 and insu ating-washers 30.

It will be seen that the holder 15 is rovided with an interior annular shou der which bears against the under side of a flange 31, formed upon the part 18 of the socket 16, and that the part 17 of said socket has a flange 32 thereon, which bears against the under side of the bracket or car 13, and that the holder 15 is exteriorly screw-threaded to fit into engagement with a screw-thread formed upon the interior of the depending annular rim 14 upon the ear 13. Said holder 15 is also provided with recesses 33 in its peri hery, so that it may be rotated by means 0 a spanner-wrench, and thus clamp the two portions 17 and 18 together, while the portion' 18 of the lamp-socket is forced a ainst the under side of the bracket 13. T e reduced upper portion 34 of the part 17 pro- 'ectsinto a hole 35, extendin through the racket 13, said lamp 19 also profecting through said hole and downward y into the interior of the shell 20.

In the wall of the casing 10 and extending therethroiigh and also through the rim 46 of the cover 11 and in alinement with the lamp 19 between the glass 1'2 and the dial 36 is an opening 37, so that the rays of light from the j tion to the dial, and can thus be entirely removed from the cover 11, upon which it is lamp 19' shine through the opening 37 and upon the face of the dial 36.

A cover 38 is provided for the lamp 19 to 1 protect the same from injury, said cover bea new lamp substituted in its place when deing provided with diverging flanges 39. con structed to slide upon ways 40, formed upon the casing-cover 11. The cover 38 is provided with a cylindrical flange -11, which has screwthreaded engagement with an adjusting-nut 42, said nut being rotatable upon the holder .5 and prevented from longitudinal movement thereon, the lower face of said nut bearing against a shoulder -13, formed upon the periphery of the holder 15, and the sired.

upper face 44 thereof bearing against the.

lower edge of the annular rim .14. In the iiitenor of the cover 38 and extending almost entirely therearound, except across the openwhich said nut is rotated said cover will be moved upwardly or downwardly with relasupported, thus giving free access to the lamp 19, which may then be unscrewed and To remove the other parts of the lamp attachment from the cover 11, the holder 15 when rotated in the proper direction becomes disconnected from the rim 46 of the cover 11, and the lamp-socket parts 17 and 18, together with the shells 20 and 21, may then be removed. as well as the holder 15.

Having thus described my invention, what I claim. and desire by Letters Patent to secure, is

1. In a device of the character described,

' a casing. a dial thereon, a cover for said dial,

ing 37, is a reflector 45, by which the rays of 1 light from the lamp 19 are projected through v the opening 37 and across the face of the dial 36.

The operation of my improved dial-illuminating device is as follows: Assuming the I and a detachable cover for sait and an electric lamp located outside said casing, a socket for said lamp. a bracket extending outside said casing. means to clamp said socket to said bracket. ways u on said cover,

l lanip adapted I to slide in said ways.

parts to be in the position illustrated in the j drawings, Figs. 1 and 2. the circuit being completed by pressing a conveniently-low cated push-button or by moving a switch, thus lighting the electric lamp 19, the rays of light shine through the opening 37 between the glass cover 12 and dial 36, thus illuminating said dial, the rays of light being projected thereon through said opening directly from said lamp, and also the reflected rays from the reflector 15 are projected through said opening across the face of the dial, said rays of light being further projected across the face of the dial by another reflector 47. which extends around the periphery of the dial inside the rim 46 of the cover 11.

If the lamp 19 becomes broken, or if for any reason it is desired to get at said lamp,

nut 4'2 in the proper direction by means of a spanner-wrench. As hereinbefore described, said not can be. rotated uponthe holder 15, but cannot be moved longitudinally thereof, so that any rotation ofsaid nut will cause the cover 38 to be moved longitudinally of the ways -10, and according to the direction in 3. In a device of the character described, a casing, a dial thereon, a cover for said dial, and an electric lamp located outside said casing, a socket for said lamp, a bracket extending outside said casing. means to clamp said socket to said bracket. ways upon said cover. a detachable cover for said lamp adapted to slide in said ways. and means to slide said detachable cover in said ways.

3. In a device of the character described. a casing. a dial thereon, a cover for said dial, and an electric lamp located outside said casing, a socket for said lamp, a bracket extending outside said casing, means to clamp said socket to said bracket. ways upon said cover, a detachable-cover for said lamp adapted to slide in said ways, and a rotatable nut having screw threaded engagement with said detachable cover. whereby said detachable cover is moved longitudinally in said ways.

.the cover 38 may be removed by rotating the 1 In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

" CHARLES F. FERXALD.

Witnesses (n.uzLEs S. Goomxe. ANNIE J. DAILEY. 

